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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b84de48bf6fe1756317712aba3b4f8d5f904e39704012499d92cc6cbb9c61b' 
  AND token = 'PNES9eVE/S+Swt8aOOm55410Fj7c7/xbptyYUPx+oz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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