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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7b96422292a0d10b00db3f3ab5bc77ab5592f4e37345b14dbdf549497f8f90' 
  AND token = '1tCJwCd6bGArhs7uRGYGhuY7hvsYXVh0hM9XDQ2SQxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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