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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8192073cf456df60107ae57abd0e8db568e47a16e0a19b3e9e447660b0d8975c' 
  AND token = 'jia6XzcUwP2FUz3GKh28jnv62UrU6HA6kvrLI/TdeGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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