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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb4ca98ca4cb188f68c6c6fea392e9ca8b8e5d8c95b2f7af5b555b466c06f4b' 
  AND token = 'UnBr/GGn/OHM4dtDVEqGY4WjZwNw7nlImbvif8sGKOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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