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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4f1147ddfc7af19a3d5ece1720f223bee732c16840f07ff8cc9f821928a9ca' 
  AND token = 'D8/eE3X7EdfdpMdKthWHiBm8Bg0zFLpsJ66M890FdOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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