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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431c840644ac5b2d9c3b23ac9b340cb3321d615baa40a54cdfa8c56c52c330d2' 
  AND token = 'X7S1mL0KHn68C++/RB3XqfN8QrTCBM2tAwmYU3v28WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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