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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a453f4de02a4eafde2e03f09a52d1b1aa7817b5bd1cb323207a8844ec69a29b6' 
  AND token = 'Rodd6rLYuKktsRUwWbqAPf5/5ClKg3IFaymoQyqLL8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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