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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a09cf7d8edba036452a360d8800b6f41d460d214a8e768c726974e088a1804' 
  AND token = '6Bb682EOwEWhL//hqg+IJIWyepDwL1kmBbG4juy0h9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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