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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e10802519c5dff853e7a29ed7f960ad3f4d59a81c5aa872e719b9a424d9758' 
  AND token = 'GOOa2GaACAwX0LyZi+xiD/DmK/9cNWmxDfJZ7I9KJ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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