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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240b14db3f3b1a379fcf84e3b23230592c63cf177eaddf483b3b025b5d649841' 
  AND token = 'eOwM1bfXpj0vydSa97nrAcubcRzp1x9KPZ8klj86nXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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