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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac76a5ce80fe177d8a8f44756d0f9070e492293a83dc726a63c9a518138f0e2e' 
  AND token = 'IbX/iN255P0nsArrtX5jaI9QKcEv9cZrJiS3JwNopRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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