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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6df88646391ff6d57c3688e644a70183ebdc78ee08fada1b2f7ac27d4730f7e' 
  AND token = 'oid15wrHnboqvMvrx0P3aZP4znDdMLeJ9JpM9jWVU/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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