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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c793722d61545924728f26ab1d5a5965c1ac22c79081581bf55d8f10ad36b5f4' 
  AND token = 'kA3tyQkNHpyLYCQQn8/kCfN95W9hJEe50rObniUrDP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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