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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58800f00d4f1fd6870eb50bea5f7112b66615746e6f4899a467761efd1002e55' 
  AND token = 'd+c1KZaSKhtwxkH87KWsoHBrS540fi1F0EoQejSbF/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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