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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953e6d65f46b90129b28749baa5d6f7ee401786ac573abf7895bb1de16c0668f' 
  AND token = 'YyNJr4EQWFX+5fJ6WHXBwQ9zjjl6VQ513XqQEu+OHE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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