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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ea4ce5468a9a9c5121567ee61a935090357a7d432a88634c3df9f41cfb9a9d' 
  AND token = 'tflqAYu5eKVZE2918m6zrq/RIbE4lvKOPP579llNp+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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