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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c90e989d3ae583214b620502c95429e3c9038ad5bcb947536f10d517d705868' 
  AND token = 'jd2sFOM+q6zCl9SwRfLrtg5/4rxUoo3NCzJhbRxcza8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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