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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994eb13c922ecb916fd53140c7a8509f7797b548742cf35b9c5d61b5e41ccf77' 
  AND token = 'ib3072Z9igU33ZwFay7qfcsXO+M8HZyEt3jIoaqKWSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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