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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9436b4d623744408a2f7178c0370a4876f10a2b40cf0c7718e298652984d4485' 
  AND token = 'DL3x6tFy5jLrVcF03HkFwfxfG2wuQwdjMrKNTaAvYdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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