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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596859f85c4da83e84b793b6d2aa4b3ebe68b2fc21c3132c494b1dd01dc43426' 
  AND token = 'azoVLtyUx9jyW9GbfI1TSau8L4NZHuyjduPsrFHq2Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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