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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b21563275fd434df3f9128381e6bfbe21c4ca12fa1213c9e54dbd2e22e714de' 
  AND token = '8CPQAJRFjse3MAYnDZbWVlq8kycnXPgbJvHvZ3VoqRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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