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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1150440a039b6fe61789e220f1da580f154ac087071f6cacd3d85b948acb87cb' 
  AND token = 'Atk16kwBmYkLkUjn4Htw5oNrJlPffltDzWqsAe8JZNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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