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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fd7b87585d7f4655980056af70b98ec4c620a4c8e5d5b35fcb63221053e1d1' 
  AND token = 'cG7QuRHeAdWWqPQq1WX3z02NSDdqE5JrK2BzC9tIyCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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