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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056e6fc239835de1606a9686b20653a3e6566c45183e6205953baac6bf639837' 
  AND token = 'nUJZHFqDOQ01Dl+GeE2Uq/DJaB+03PZNU1V+9S0YD6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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