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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00992a97eefea75ac01dff1d11a3103593d58286949dfa0374709fc82411c1ab' 
  AND token = 'xhaW+63SGeygdLm9XpUBpiQp0MXAR82MdMlKsOisXH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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