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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8631f01c61a468969201b8596debfb741b71b5e1cb5f4a4bc67cca66ac4c355d' 
  AND token = 'J4iRytbTZTmqo/7g9jPtNC891wFYKX4Y7ERrAgfMORY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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