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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e353852ef0c0a2fe0b2ca2d339596e66e6be3ccc4f8e6a6ea47d8dbd5cdaa9f1' 
  AND token = 'pf/WnEY36sjV2i8d+SyG6urBwXKO3BLAmQ0StV6Rq1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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