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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097e5fd9455b0b3706037022f49f262172c8873702c232013b06396864f54872' 
  AND token = 'DxLfrCco7MrPvp0KcgxT4hP/awOX/keZc4KaY7E8Jmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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