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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2eb184aaa8c0e0312ccfe0dfbad512f578574f9658ca9daf942aff638f8a3c2' 
  AND token = 'FOgi71C0Twx0qJooeyozfvEr+IZNMLpA0uEKvqP7Dc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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