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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb83042c7bb0d836180945958e48cf76ccf36ae40178b8399093d62f825e3156' 
  AND token = 'mxHSuXCWkGe1Hsi0txOY/hdO4qNJwe04OShHzpksozM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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