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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53dfcaa971dcc73fc085cb22449bce58a8427444ff58f1353cc18b916eeee1c6' 
  AND token = 'O2MtxCyz88AQHjojY0o4n0xayMm6LHMWn/gbzS3NI4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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