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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824d61c64821c9d903af819b2c271de23e9bcd98974d290f6cec2f1741e9ae01' 
  AND token = '5kcRf34+SNO9qoKKsqurHC0qzir1C5/2nGfVkf+zDKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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