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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6daa65e08ccf4169f900cb9b03bcbb5b5cb107f60ce133934bdb24a9b9a7cd' 
  AND token = '7FFuGB/K5FmhymuYXs9pCmRnmz1LZtsMECrmE4yNjdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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