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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd92c11986558a94884f932850d1c35b2f330d7c4e1efc4a3bd0e8481e528bf' 
  AND token = 'OAYr/NDRdUxnbRAuoWXHi3i4moCUVzkLI4/xMAZh8n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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