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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b16e1cc51cfc8f54b3ad9cdfabf24c133c41a94ee2b31d67c9fabf9c72dc0a' 
  AND token = 'mXVF7U4epuxVpvRGdTseRxHP7MFvHAhQusMi4akAIUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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