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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b18efbc03eeb14a3b449780d169d73cdca6d607fb34d06fe65f500bc54079e1' 
  AND token = '9eAiTHIhC9Lef0KMeTerJxIp3gnLXFp37fZT8anevjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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