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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7105cb341de956ac0971f0575983f4c9233c315ea97122c9ca6eb33ddb0ea671' 
  AND token = 'NUW/MBdvN6CK/eUXHo/NQ1DmCRGBQmlXShe5f4XyNLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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