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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66ca565afd6e6f79b22475e5e6e3c02dd9da3763d90ae23355c81af8a5875ee' 
  AND token = '0+5EVZB5Ucf1ABy2fGKkItuZSdIha31NE3kDdLWaBh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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