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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae84c4ec85d88ed205f47e8cc0c47b8fd41b7d94d6d33b95fb94233fa61a68ee' 
  AND token = 'BGrsg/8zGry+gb41OZYiar5VHXdgO67eIluYqqa4WK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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