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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bffc6cc14813d35708cbcebcfd2468a6c48655e875f5f6fd7df242e3d7df0b0' 
  AND token = 'aCCryh+GNrlEY6nr32Sw+aCDZXDSYnsTPJQPg9dsRJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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