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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5341cb20650d5f3c8bd36e63221a33163849e5b36e437f3bc04c7de133154c21' 
  AND token = 'kb/gwlVltQ3glsWI+VScMut+GNpiqPi+3CLbNtvR52I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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