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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4eb4517ca4faa3a001c5ada297a4302cf9037af1c005c00dfd42ba4f962f0a' 
  AND token = 'S5FFN7F0diByS45MqQdQ7h1NDaNVUbN2h9+C8aDndiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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