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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923d6508ee868a753b127bf940e52f52560c6a481e56c0bbf66c0cc23e627076' 
  AND token = 'Z6KxiJQapL6tX6wiXFQT+hPqcFprg3yVFWD+WMUVkHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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