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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a323ea635316d35a4f5d06a618a5cf017d605fa79485bc6f06edcf24ab3b81' 
  AND token = 'XjhMbB3wtumy52wPdmuNt/Jo85lbYrTzemQNCpCVG0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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