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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7ab09a30ba5b0be87b2ac9a1456ffb31a6bfb879e78622b4cab83f06bd8b39' 
  AND token = 'Ee3Nu2MPmap3/p0Ulry4YSS4zZYQRdgK7j9829NDbdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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