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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fd8e13354c46756152b480af43d2c091f55fb3624717f6aa045fbaebe84455' 
  AND token = 'rf9lOej7+r4xaphF4BreglaXpod3qrSf4YBy24WlfCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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