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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c615ab4f6c1763294490c29e4bf9180872a33af859ccbb228c3f1cefa048f79b' 
  AND token = 'ju73Ar1ypMsbCWNKSfTWDu5qGnVHzthpQYm4KUba/Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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