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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36cbaa49da21de71aab11afd2566a7b2f2a8ecc38759f46d72570330c3a6459' 
  AND token = 'Y0LqVyhqms//hqeoSzyfMGsSSF82/IBOYZaHJSf0yIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}