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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b025542e47cbaa9dbeb6ccdb54aabd20d4ecbd9b8b7373eb3a9a888e1b7524f' 
  AND token = 'IJL3iuUKXN3qEbFDoZfivrGJnD2jPz0bc64vvxRg9ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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