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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c9b2136cf8f58f3ac9b5879e86883bdbd7ca190da3c1cdb47d793714c3bb9d' 
  AND token = 'CQn7uqMs0aSVarmylWRV2XflqELzgN44BE6Sl2+aWC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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