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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f2baa45738d72331a48311f423736246465b6713271ad83ceaf93c90d22284' 
  AND token = 'V2QUD0QRUJJcN6Fyn8Rw6WbXfRjvFfZ6qhj/Waj4t9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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