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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846691dfffbd6d9f3251e8e107a13d638507532314171f4677dcc13ff6b12c43' 
  AND token = 'iDLr9lcQEiiWakRlIHdLWGGh8917UCzxu9u9L1h276g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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