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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ae223fa83a50bdf58aab358de5d06af2a8e306b54aed33bff7fbafa70b4a03' 
  AND token = 'Pn1nZZTjgw7FRss7l3q2iCMUBNGp3OvwCV5lk0Vls8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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