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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514ba2818a19cbb775be6d04c66d95a1abcd6a9cb87960b2ad05cab2943faa59' 
  AND token = 'KcCeEO5JlyjeQdfyuzet1plJGwu2+s5Al4OemK11vIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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