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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374d7eddd3356c2b6ec4f2e4425eb817f4e3ca2434fe3f1c623c2b671396cd87' 
  AND token = 'VQ+lL6lO7S3qShpudsOEIfKX8vn9fW8r58e2JZis2Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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