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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e17bfa07e4e58bed41ad8dcdb25f2f419434449268a45148a09143f3c611a8' 
  AND token = 'GxxeWmpm3XZFe2u8Z0BweFZ4ty3/Bn/yOfOoSXAug9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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